Abstract: In order to study the mechanical performance of truss transmission tower of glass fiber reinforced polymer ( GFRP) ，a full-scale model of a truss transmission tower with a height of 8. 75 m which composed of 1. 25 m high steel earth support and 7. 5 m tower shaft etc，was tested under three different load conditions． Base on the experimental results，it was revealed that the elastic deformation of the GFRP tower was evident due to the relatively low Youngs modulus，yet the maximum stress of the structure under the most unfavorable load was much lower than the design strength of the material． Which showed that the GFＲP tower had relatively good overall mechanical performance，it could satisfy the requirement of the design and use of electric power projects．